As she approaches the 13th – yes, 13th – anniversary of her landing on Mars, Opportunity is still going strong. As you can see from the following images, she’s now slowly but surely working her way back uphill, across terrain strewn with boulders, rocks and stones, ready to drive back out onto the plain around Endeavour Crater before heading for that gully further south along the crater’s rim. When will she get there? No way of knowing; that depends on how many things distract her on her way to the gully…